This monograph is one of APCEIU's EIU Best Practices Series, which aims to encourage educators, scholars, and activists to implement and share local initiatives on EIU. The Series No.7 is a case study of two Thai schools within the Sister Schools Project Network, which is under the UNESCO ASP NET and UNESCO Club. As schools visited other schools in the network, students became involved in fundraising to support one another, thereby naturally acquiring invaluable team building skills, intercultural understanding, and social responsibility. This case shows that sister school network system can foster values of sharing, caring, and loving, despite socio-economic disparity among students.